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United States Patent |
5,062,519
|
Haruta
|
November 5, 1991
|
Escalator system with convertible step unit
Abstract
An escalator system comprising a main frame (1) defining a circulating loop
path (2) therein, a plurality of steps (3,4,5,6) connected in an endless
step loop disposed in the loop path and a special convertible step unit
(4,5,6) disposed in the step loop and having a movable member (4a,11). The
special step unit defines at least one of the steps with the movable
member in an ordinary position in an ordinary operating mode, and the step
unit defining a special step having a broad tread surface with the movable
member displaced in a broad step position in a special operating mode. A
displacement mechanism (45,46,13) having one end engageable with the
special step unit (7) is disposed for displacing the movable member of the
special step unit between the ordinary position and the broad step
position by a drive force of the step loop which is a drive force
component in the direction of width of the step. The other end of the
displacement mechanism is engageable with a guide rail (27) only in the
special operating mode for moving the displacement mechanism in the step
width direction by a camming action of the guide rail.
Inventors:
|
Haruta; Yasumasa (Inazawa, JP)
|
Assignee:
|
Mitsubishi Denki Kabushiki Kaisha (JP)
|
Appl. No.:
|
530797 |
Filed:
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May 30, 1990 |
Foreign Application Priority Data
| May 31, 1989[JP] | 1-137637 |
| May 31, 1989[JP] | 1-137638 |
Current U.S. Class: |
198/333 |
Intern'l Class: |
B66B 023/12 |
Field of Search: |
198/333,321,326
|
References Cited
U.S. Patent Documents
4557369 | Dec., 1985 | Ishida et al. | 198/333.
|
4681207 | Jul., 1987 | Goto et al. | 198/333.
|
4863006 | Sep., 1989 | Kotkata et al. | 198/333.
|
Foreign Patent Documents |
6319437 | Jul., 1983 | JP.
| |
6319438 | Jul., 1983 | JP.
| |
6361266 | Aug., 1983 | JP.
| |
6323113 | Dec., 1983 | JP.
| |
100989 | Apr., 1990 | JP | 198/333.
|
Primary Examiner: Valenza; Joseph E.
Assistant Examiner: Dixon; Keith
Attorney, Agent or Firm: Leydig, Voit & Mayer
Claims
What is claimed is:
1. An escalator system comprising:
a main frame defining a circulating loop path;
a plurality of steps connected in an endless step loop disposed in said
loop path;
a convertible step unit disposed in said step loop, at least one step in
said unit having a movable member disposed in a first position during an
ordinary operating mode and disposed in a second position during a special
operating mode;
a displacement mechanism, associated with the movable member and connected
to said convertible step unit, for displacing the movable member of said
convertible step unit between the first position and the second position
by a drive force of said step loop which is a drive force component in the
direction of width of a step; and
a movable guide rail unit engageable with said displacement mechanism
during the special operating mode which moves said displacement mechanism
in the step width direction by a camming action of said guide rail and
converts said convertible step unit.
2. An escalator system as claimed in claim 1, wherein said displacement
mechanism comprises:
a movable body having one end engageable with said guide rail unit to be
displaced in the width direction of said step; and
a drive force transmission mechanism, having one end engageable with said
movable body and the other end engageable with said movable member of said
convertible step unit, which is rotated by the displacement of said
movable body in the step width direction causing the displacement of the
movable member.
3. An escalator system as claimed in claim 2, wherein said convertible step
unit comprises:
a first convertible step which defines a broad tread surface with a first
movable member displaced; and
a second convertible step disposed adjacent to an upper level side of said
first convertible step for defining an inclined tread surface with a
second movable member displaced.
4. An escalator system as claimed in claim 3, wherein said convertible step
unit further comprises:
a third convertible step having a main body and a tread board liftably
mounted to said main body; and
a fourth convertible step disposed adjacent to an upper side of said third
convertible step which causes a displacement of the movable member for
defining a flat broad tread surface together with the tread board of said
third convertible step.
5. An escalator system as claimed in claim 1, wherein a guide rail of said
guide rail unit is translatingly movable into and out of engagement with
said displacement mechanism in the special operation mode.
6. An escalator system as claimed in claim 1, wherein a guide rail of said
guide rail unit is rotatably movable into and out of engagement with said
displacement mechanism in the special operation mode.
7. An escalator system as claimed in claim 1, wherein said guide rail unit
comprises a detection switch for detecting an abnormality generated in the
special operation mode.
8. An escalator system as claimed in claim 1, wherein said guide rail unit
prevents displacement of said movable member displacement mechanism in the
step width direction.
9. An escalator system as claimed in claim 1, wherein said guide rail unit
comprises a movable guide rail which engages said movable member
displacement mechanism during the conversion of said convertible step unit
from the ordinary operation mode to the special operation mode and
displaces said movable member displacement mechanism in the step widthwise
direction, and a stationary guide rail which engages said movable member
displacement mechanism during the conversion of said convertible step unit
in the step width direction.
10. An escalator system according to claim 1, where a movable member of one
of the steps in said convertible step unit is an tiltable tread board.
11. An escalator system according to claim 1, where a movable member of one
of the steps in said convertible step unit is an elevatable tread board.
12. An escalator system comprising:
a main frame defining a circulating loop path;
a plurality of steps connected in an endless step loop disposed in said
loop path;
a convertible step unit disposed in said step loop, at least one step in
said step unit having a movable member disposed in a first position during
an ordinary operating mode and disposed in a second position during a
special operating mode;
a displacement mechanism, connected to said convertible step unit, for
displacing the movable member of said convertible step unit between the
first position and the second position by a drive force of the step loop
which is a drive force component in the direction of width of a step; and
first and second movable guide rail units pivotally attached to said main
frame and engageable with said displacement mechanism during the special
operating mode which move said displacement mechanism in said step width
direction by a camming action of said guide rail and convert said
convertible step unit.
13. An escalator system according to claim 12, further comprising an
actuator mechanism driven by a motor which brings said convertible step
unit into engagement with said guide rails during the special operating
mode.
14. An escalator system comprising
a main frame defining a circulating loop path;
a plurality of steps connected in an endless step loop disposed in said
loop path;
a convertible step unit disposed in said step loop, at least one step in
said step unit having a movable member disposed in a first position during
an ordinary operating mode and disposed in a second position during a
special operating mode;
a displacement mechanism, connected to said convertible step unit, for
displacing the movable member of said convertible step unit between the
first position and the second position by a drive force of the step loop
which is a drive force component in the direction of width of a step;
a pair of stationary guide rails rigidly attached to said main frame;
a pair of movable guide rails disposed inside said pair of stationary guide
rails pivotally attached to said main frame which move said displacement
mechanism in said step width direction by a camming action of said guide
rails and convert said convertible step unit.
15. An escalator system according to claim 14, where the stationary guide
rails and the movable guide rails include detection switches.
Description
BACKGROUND OF THE INVENTION
This invention relates to an escalator system with a convertible step unit
and, more particularly, to an escalator system having convertible steps
for receiving thereon a wheel chair or the like for the handicapped.
The examples of the conventional designs of the escalator to which the
present invention pertaines can be found in Japanese Patent Publication
No. 63-19437 in which a tread board of some of the steps is moved up and
downwardly at the landings, Japanese Patent Laid-Open No. 63-61266 in
which one portion of the tread board is moved up and down between an
inclided position and a horizontal position, and Japanese Patent
Publication No. 63-19438 wherein a wheel stopper is raised above the tread
surface, and these special steps are connected in an endless loop of
ordinary steps to be circulatingly driven along a circulating path
disposed in an escalator main frame.
During ordinary mode of operation of the above-discussed escalator system,
the special, convertible steps serve as ordinary steps to carry
passengers. During the wheel chair carrying mode of operation, the movable
member such as the movable tread board, the wheel stopper and the
drop-down tread board mounted on the convertible steps are brought into
the respective operated position to carry the wheel chair. In order to
convert the mode of operation of the convertible steps of the conventional
escalator system between the ordinary mode and the wheel-chair carrying
mode, the escalator must be stopped when the convertible steps are at the
upper or lower lading to actuate the movable members between the actuated
and inactuated positions, decreasing the transportation capacity of the
escalator system and requiring some maneuver.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide an escalator
system with a convertible step unit free from the above-discussed problems
of the conventional escalator.
Another object of the present invention is to provide an escalator system
with a convertible step unit which has a higher operating efficiency.
Another object of the present invention is to provide an escalator system
with a convertible step unit which can be converted between two
operational modes without stopping the escalator system.
Still another object of the present invention is to provide an escalator
system with a convertible step unit in which the conversion between two
operational modes can automatically be made.
A further object of the present invention is to provide an escalator system
with a convertible step unit in which the conversion between two
operational modes can smoothly be made without generating shocks or
vibrations.
With the above objects in view, the escalator system of the present
invention comprises a main frame defining a circulating loop path therein,
a plurality of steps connected in an endless step loop disposed in the
loop path and a convertible step unit disposed in the step loop and having
a movable member. The convertible step unit defines at least one of the
steps with the movable member in an ordinary position in an ordinary
operating mode, and the step unit defining a convertible step having a
broad tread surface with the movable member displaced in a broad step
position in a convertible operating mode. A displacement mechanism having
one end engageable with the convertible step unit is disposed for
displacing the movable member of the convertible step unit between the
ordinary position and the broad step position by a drive force of the step
loop which is a drive force component in the direction of width of the
step. The other end of the displacement mechanism is engageable with a
guide rail only in the spacial operating mode for moving the displacement
mechanism in the step width direction by a camming action of the guide
rail.
The displacement mechanism may comprise a movable body having one end
engageable with the guide rail to be displaced in the width direction of
the step, and a drive force transmission mechanism, having one end
engageable with the movable body and the other end engageable with the
movable member of the convertible step unit, for being rotated by the
displacement of the movable body in the step width direction to cause the
displacement of the movable member.
In a preferred embodiment of the present invention, the convertible step
unit may comprise a first convertible step for defining the broad tread
surface with a first movable member displaced, a second convertible step
disposed adjacent to an upper level side of the first step for defining an
inclined tread surface with a second movable member displaced. The
convertible step unit may further comprise a third convertible step having
a main body and a tread board liftably mounted to the main body, a fourth
convertible step disposed adjacent to the upper side of the third
convertible step and causing a displacement of the movable member for
defining a flat broad tread surface together with the tread board of the
third convertible step.
The guide rail may be translatingly movable into and out of engagement with
the other end of the displacement mechanism in the broad tread operation
mode, or may be rotatably movable into and out of engagement with the
other end of the displacement mechanism in the broad tread operation mode.
DESCRIPTION OF THE DRAWINGS
The present invention will become more readily apparent from the following
detailed description of the preferred embodiment of the present invention
taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic sectional side view illustrating one embodiment of
the escalator system with a convertible step unit of the present
invention;
FIG. 2 is an enlarged schematic side view of the load-bearing sloped
portion of the escalator system illustrated in FIG. 1;
FIG. 3 is an enlarged schematic side view of the lower landing portion of
the escalator system illustrated in FIG. 1;
FIG. 4 is an enlarged schematic side view of the upper landing portion of
the escalator system illustrated in FIG. 1;
FIG. 5 is an enlarged sectional side view of the convertible step with the
fork;
FIG. 6 is a sectional plan view of the convertible step illustrated in FIG.
5 with the fork in its actuated extended position;
FIG. 7 is a sectional plan view of the convertible step illustrated in FIG.
5 with the fork in its inactuated retracted position;
FIG. 8 is an enlarged sectional side view of the convertible step with the
wheel stopper;
FIG. 9 is a sectional plan view of the converted step illustrated in FIG. 8
with the wheel stopper in its actuated projecting position;
FIG. 10 is a sectional plan view of the converted step illustrated in FIG.
8 with the wheel stopper in its inactuated retracted position;
FIG. 11 is an enlarged sectional side view of the convertible step with the
drop-down tread board;
FIG. 12 is a perspective exploded view the drop-down step illustrated in
FIG. 11;
FIG. 13 is a sectional plan view of the converted step illustrated in FIG.
11 with the drop-down tread board in its inactuated, horizontal position;
FIG. 14 is a sectional plan view of the converted step illustrated in FIG.
11 with the drop-down tread board in its actuated, sloped position;
FIG. 15 is a plan view illustrating the upper guide rail arrangement;
FIG. 16 is a plan view illustrating the lower guide rail arrangement;
FIG. 17 is a cross-sectional view taken along line XVII--XVII of FIG. 16;
FIG. 18 is a cross-sectional view taken along line XVIII--XVIII of FIG. 16;
FIG. 19 is an enlarged sectional side view of the convertible step with the
fork of the escalator system of another embodiment of the present
invention; and
FIG. 20 is a sectional plan view of the convertible step illustrated in
FIG. 19 with the fork in its actuated extended position.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIGS. 1 to 4, the escalator system of the present invention comprises a
main frame 1 including a horizontal upper and lower end portions 1a and 1b
and an intermediate sloped portion 1c connecting between the end portions
1a and 1b. The main frame 1 has disposed thereon an endless circulating
loop path defined mainly by guide rails mounted to the main frame 1. The
circulating path 2 has a load-bearing run 2a on the upper side of the main
frame 1, turn-around portions 2b at the upper and the lower end portions
1a and 1b and return run 2c on the bottom side of the main frame 1. The
escalator system also comprises a plurality of ordinary steps 3 connected
along the circulating path 2, a convertible step unit 7 for receiving a
wheel chair thereon having special or convertible steps 4, 5 and 6
connected in series in the named order. The convertible step unit 7 is
inserted between the ordinary steps 3. It is seen that a step 8 disposed
adjacent to the convertible step 4 has mounted thereon an actuator 8a for
the purpose which will become apparent later on. The first convertible
step 4 on the front side of the convertible step unit 7 when the steps are
ascending comprises a drop-down tread board 4a, the second convertible
step 5 next to the first convertible step 4 comprises a fork 11 and the
third convertible step 6 on the rear side of the step unit 7 comprises a
movable tread board 52d and a wheel stopper 12. In order to operate these
movable members 4a, 11, 52d and 12, a drive force transmission mechanism
13 is mounted to each of the convertible steps 4, 5 and 6. All the steps
including the convertible steps 4, 5 and 6 as well as the step 8 have step
axles connected at the opposite ends thereof to endless step chains 14
which are connected to a drive unit (not shown) so that they are driven
along the circulating path 2.
As illustrated in FIGS. 1 to 18 inclusive, each step has mounted on its
front portion a step axle 15 having a front roller 16 at the opposite ends
thereof and has on its lower, rear portion a rear rollers 17. Each of the
steps 3, 4, 5, 6 and 8 is connected at the step axle 15 to the endless
step chains 14 and is supported at the front and the rear rollers 16 and
17 by guide rails 18 and 19 mounted to the main frame 1 for the guided
ascending and descending movements along the circulating path 2.
Within the upper and the lower end portions 1a and 1b of the main frame 1,
upper and lower guide rail units 25a and 25b are disposed. Since these
guide rail units 25a and 25b are of similar construction, the description
will first be made as to the lower guide rail unit 25b. As shown in FIGS.
6 and 15, a pair of stationary guide rails 26 are disposed at the
positions widthwisely spaced apart from each other and a pair of movable
guide rails 27 are disposed inside of the stationary guide rails 26.
As best seen in FIG. 15, the outer stationary guide rails 26 comprise a
rail main body 28 made of an angle member attached at its opposite ends to
the main frame 1. The rail main body 28 comprises a first end 28a close to
the floor 68, a second end 28b on the intermediate sloped portion side and
located at a position outside of the first end 28a, and an intermediate
inclined portion 28c connected between the first and the second ends 28a
and 28b. An outer guide member 29A which is an angle member is elastically
mounted at each end thereof to the intermediate portion 28c of the rail
main body 28 to extend over the substantially entire length of the
intermediate portion 28c. The guide member 29A is supported by two spring
supports each comprises a spring bracket 30 attached to the rail main body
28, a rod 31 with a spring seat 32 extending from the guide member 29A and
a compression spring 33 disposed between the spring seat 32 of the rod 31
and the spring bracket 30. There is also provided a sensor switch 34
mounted on the main body 1 by a switch bracket 35 so that it faces the pin
29a secured to the guide member 29A.
The movable guide rail 27 comprises a rail main body 36 which is an angle
member. The rail main body 36 has a first end 36a close to the floor 68
securely attached to the main frame 1, an intermediate portion 36c
pivotally connected by a pivot pin 37 to the first end 36a and a second
end 36b pivotally connected by another pivot pin 37 to the free end of the
intermediated portion 36c. The second end 36b has a nut 36d which is
threadably engaged with one end of a lead screw 38 connected to a drive
motor 39 through a shaft 39a, sprocket wheels 40 and 41 and a chain 42
wound around the sprocket wheels 40 and 41. An inner guide member 29B
similar to the outer guide member 29A is elastically mounted to the
intermediate portion 36c of the movable guide rail 27 by the similar
spring support arrangement. A detector element 34 similar to that disposed
on the stationary guide rail 26 is mounted between the guide member 29B
and the intermediate portion 36c of the movable guide rail 27.
When the drive motor 39 is rotated, the lead screw 38 is rotated through
the sprocket wheels 40, 41 and the chain 42, so that the second ends 36b
of the movable guide rail 36 are moved widthwise of the escalator steps.
Thus, the movable guide rails 36 can be selectively shifted according to
the direction of rotation of the motor 39 between a wheel chair carrying
mode illustrated in FIG. 15 in which the movable ends 36b of the movable
ride rails 36 are separated and the movable guide rails 36 are positioned
to extend along the slanted stationary guide rails 26 and an ordinary
operation mode in which the movable ends 36b of the movable guide rails 36
are located relatively close to each other so that the movable guide rails
36 extend in parallel to each other in the direction of travel of the
escalator steps.
The escalator system also comprises an upper guide rail unit 25a at the
upper end portion of the main frame 1 in conjunction with an upper floor
69 as illustrated in FIG. 16. The upper guide rail unit 25a has a
structure quite similar to that illustrated and described in conjunction
with FIG. 15.
As illustrated in FIG. 5, the convertible step 5 provided with the form has
rotatably mounted thereon guide rollers 43 and 44 mad of rubber between
the stationary and the movable guide rail 26 and 27 on both sides. The
rollers 43 and 44 are arranged to transmit a movable member or drive force
to forks 11 of each side through a drive force transmission mechanism 13a.
That is, the drive force transmission mechanism 13a comprises movable 45
and 46 connected to the guide roller 43 and 44 through vertical axles
secured to the movable elements 45 and 46. The movable elements 45 and 46
are slidably supported by two shafts 47 and 48 horizontally extending
widthwise in the step 5 and having formed thereon racks 45a and 46a
extending in the direction of width of the step 5. The drive force
transmission mechanism 13a also comprises pinions 49a and 50a as well as
pinions 49b and 50b secured on the lower and the upper ends of the shafts
49 and 50 rotatable supported to the step 5 by an unillustrated bearings.
The pinions 49a and 50a engage with the widthwise racks 45a and 46a on the
movable elements 45 and 46. The drive force transmission mechanism 13a
further comprises two forks 11 slidably mounted to the step 5 by fork
guides 51 and having formed thereon racks 11a to which the pinions 49b and
50b engage. The forks 11 can be slidably moved between an extended
position and a retracted position. In the extended position, the forks 11
are projected from the rear end of the convertible step 5 and inserted
into openings 52c formed in front and rear fork brackets 52a and 52b
secured to a movable tread board 52d of the movable step 52 of the
convertible step 6. In the retracted position, the forks 11 are withdrawn
from the fork brackets of the convertible step 6 and contained under the
tread board 5a of the convertible step 5.
As illustrated in FIG. 8, the convertible step 6 comprises a step main body
53 which supports the movable step 52 in such a manner that the movable
step 52 can be elevated from the main body 53. The movable step 52 has a
movable riser extending downwardly from the rear end of the movable tread
board 52d along the inner surface of the riser of the step main body 53.
The convertible step 6 also comprises a wheel stopper 12 which can be
moved between a projected position illustrated in FIG. 8 and a retracted
position, and a drive force transmission mechanism 13 for actuating the
wheel stopper 12 between the projected position and the retracted
position. The drive force transmission mechanism 13b of the convertible
step 6 is of generally similar construction to the drive force
transmission mechanism 13a of the convertible step 5, and comprises rubber
guide rollers 43 and 44 attached to the movable elements 45 and 46
slidable along guide rails 47 and 48 and having widthwise rack, pinions
49a and 49b connected by axles 49 rotatably supported by bearings (not
shown) mounted to the step main body 53 and a pair of wheel stoppers 12
slidably supported by bearings 12a to the main body 53.
As illustrated in FIGS. 11 and 12, the drop-down convertible step 4 with a
tiltable tread board comprises a step main body 55 having a pair of side
members including a horizontal tread 54 and a drop-down tread 56 tiltably
supported between the main body side members 55 by pins 57. The drop-down
tread 56 has a movable tread board 4a which defines a flat tread surface
together with the horizontal treads 54 on the side members 55. The side
faces of the drop-down tread 56 have a pair of holder rods 4b slidably
supported by bearings 4c (FIG. 13) attached to the tread 56 so that the
holder rods 4b are retractable with respect to side surfaces of the
drop-down tread 56. The side faces of the drop-down tread 56 also have a
pair of arcuated cam grooves 4d extending along an arc formed about the
pivot pins 57. The drop-down tread 56 has a pair of rollers 58 rotatably
mounted thereon. Also, the main body side members 55 have circular holes
55a into which the projecting end of the holder rods 4b can be inserted
and cam follower rollers 55b which can be received and cammed when the
movable drop-down tread 56 and the main frame members 55 are assembled.
The main body side members 55 also have guide rollers 17.
The drop-down step 4 also comprises a drive force transmission mechanism
13c which comprises guide rollers 43 and 44 and movable elements 45 and 46
rotatably supporting the guide rollers 43 and 44 and slidable along guide
rails 47 and 48. The movable elements 45 and 46 have formed thereon a
widthwise rack with which pinions 49a are engaged and the pinions 49a and
pinions 49b are connected to each other and rotatably supported to the
step main body. The holder rods 4b slidably supported by bearings 4c have
connected thereto racks 4e which engage the pinions 49b so that they are
extensible from the side walls of the drop-down tread 56 into the
engagement holes 55a of the main body side members 55.
As best illustrated in FIG. 11, the rollers 58 mounted to the drop-down
tread 56 are supported on guide rails 59 for dropping down the tread 56.
The drop-down guide rails 59 extend at the same level as the guide rail 19
for guiding the rear wheels 17 of the step main body 55 at the upper and
the lower end portions 1a and 1b of the escalator main frame 1 and extend
at a level lower than that of the guide rails 17.
FIG. 1 depicts a conversion switch 61 and an operating switch 62 located on
each of the upper and lower end portions of the handrail.
As illustrated in FIGS. 3 and 4, a deceleration switch 64 is mounted to the
main frame 1 at the lower end portion of the return run 2c for detecting
that the convertible step unit is approaching the lower landing floor 68
and reducing the speed of the convertible step unit at the entrance for
the safe and easy loading of the wheel chair 70 (FIG. 2) on the escalator
from the lower landing floor 68 during the upward operation. An
acceleration switch 65 is also disposed at the lower end portion of the
load-bearing run 2a for accelerating the speed of the convertible step
unit which is reduced at the lower end portion of the return run 2c to a
normal operating speed. At the upper end portion of the load-bearing run
2a, a deceleration switch 66 is disposed to detect and decelerate the
speed of the convertible step unit as it reaches the upper exit landing 69
and an acceleration switch 67 is disposed at the upper end portion of the
return run 2c for the safe loading of the wheel chair on the escalator. In
the illustrated embodiment, the switches 64 to 67 are actuated by an
actuator 8a mounted to the step 8 that is connected in front of the
drop-down step 4 of the convertible step unit. It is seen that the lower
landing board 68 has a comb plate 71 and the upper landing board 69 has a
comb plate 72.
The structure of the escalator other than that of the upper and lower guide
rail units 25a and 25b, the guide rollers 43 and 44 and the drive force
transmitting mechanism 13 is substantially similar to those disclosed in
Japanese patent Publication No. 63-19437, Japanese Patent Laid-Open No.
63-61266 and Japanese Patent Publication No. 63-19438.
The operation of the escalator apparatus of the present invention will now
be described.
When it is desired to convey the wheel chair 70 upward by the escalator
apparatus of the present invention during the ascending operation, the
wheel chair 70 is held on the lower landing floor 68 and the person on the
wheel chair 70 or a person who assists the wheel chaired person depresses
the switch 62 of the operating switch 61 for changing the mode of
operation of the escalator apparatus from the normal mode to the wheel
chair carrying mode. As the convertible step unit 7 including the
convertible steps 4, 5 and 6 approaches the entrance or the lower landing
area of the escalator apparatus, the actuator 8a on the step 8 engages the
deceleration switch 64 to actuate it to decelerate the escalator apparatus
through a control circuit (not shown). The control circuit also energizes
the electric motor 39 of the lower guide rail unit 25b disposed on the
lower end portion 1b of the main frame 1 to drive the lead screw 38
through the shaft 39a, the sprocket wheel 40, the endless chain 42 and the
sprocket wheel 41. This rotation of the lead screw 38 causes the movable
guide rails 27 to shift from their usual position for the ordinary mode of
operation in which they extend in the direction of travel of the steps to
the wheel chair carrying mode of operation (FIGS. 6 and 15) in which the
movable ends of the movable guide rails 27 connected to the lead screw 38
are moved outwardly so that the movable guide rails 27 extend obliquely
with respect to the direction of movement of the steps and along the
stationary guide rails 26.
As the convertible steps 4, 5 and 6 are moved into this area in which the
lower guide rail unit 25b is disposed, each of the guide rollers 43 and 44
of the drop-down step 4 is introduced between the stationary guide rail 26
and the movable guide rail 27 of the respective pair. The guide rollers 43
and 44 are guided or cammed by the skewed guide rail unit 25b as they move
along the guide rail unit 25b so that the movable elements 45 and 46 with
racks 45a and 46a are moved transversely or widthwise with respect to the
step 4 along the rails 47 and 48. This widthwise sliding movement of the
racked movable elements 45 and 46 causes the rotation of the pinions 49a
and 50a which are in engagement with the racks 4e formed on the slidable
holder rods 4b to retract the holder rods 4b from the side main tread
members 55. Since the movable portion 56 is supported in its horizontal
position by the guide rollers 58 on the rails 59 at this time, the movable
portion 56 of the step 4 gradually tilts or drops down as illustrated by
the dot and dash line 4a in FIG. 11 as the rollers 58 moves along the
guide rails 59 which is positioned at a level lower than the guide rail 19
supporting the guide rollers 17 on the side members 55 in the sloped
section of the stairway.
As the convertible step 5 is moved into the area in which the lower guide
rail unit 25b is disposed and the guide rollers 43 and 44 of the step 5 is
introduced between the stationary guide rail 26 and the movable guide rail
27. The guide rollers 43 and 44 are guided or cammed by the skewed guide
rail unit 25b as they move along the guide rail unit 25b so that the
movable elements 45 and 46 with racks 45a and 46a are moved transversely
or widthwise with respect to the step 5 along the rails 47 and 48. This
widthwise sliding movement of the racked movable elements 45 and 46 causes
the rotation of the pinions 49a and 50a which are in engagement with the
racks 11a formed on the slidable forks 11. Therefore, the forks 11 are
pushed out from the convertible step 5 as shown by arrows D in FIGS. 5 and
6 and inserted into teh fork brackets 52a and 52b mounted to the movable
tread board 52d of the next convertible step 6.
With the convertible step unit 7 in this state, the wheel chair 70 can now
be moved from the lower landing board 68 onto the tread board 5a of the
convertible step 5 and the movable tread board 52d of the convertible step
6.
As the convertible step 6 is moved into the area in which the lower guide
rail unit 25b is disposed and the guide rollers 43 and 44 of the step 6
are guided or cammed by the skewed guide rail unit 25b as they move along
the guide rail unit 25b, the movable elements 45 and 46 with racks 45a and
46a are moved transversely or widthwise with respect to the step 6 along
the rails 47 and 48. This widthwise sliding movement of the racked movable
elements 45 and 46 causes the rotation of the pinions 49a and 50a which
are in engagement with the racks 12b formed on the wheel stopper 12
slidably supported by the bearing 12a. Therefore, the wheel stoppers 12
are pushed out from the tread surface 52d of the step 6 as illustrated in
FIG. 8.
As the convertible step unit 7 leaves the horizontal section of the step
travel path in which the lower guide rail unit 25b is installed and moves
into the sloped section of the stairway of the escalator, the acceleration
switch 65 of the unillustrated control circuit (not shown) is actuated by
the actuator 8a mounted on the step 8 in front of the first convertible
step 4 to increase the speed of the escalator to the ordinary speed. Also,
the control circuit (not shown) causes the electric motor 39 of the lower
guide rail unit 25b to rotate in the direction opposite to that described
in conjunction with the operation of the deceleration switch 64.
Therefore, the movable guide rails 27 are returned o the original usual
position in which the movable guide rails 27 extend in the direction
parallel to the direction of movement of the steps.
As the convertible step unit 7 ascend the sloped section of the stairway,
the movable portion 56 of the drop-down step 4 is lowered because the
movable portion 56 is supported by the rollers 58 travelling along the
guide rails 59 lower than the guide rails 19 which support the rollers 17
of the main step portion 55. Also, as the second step 5 and the third step
6 ascend the sloped section of the stairway, the third step 6 is lowered
relative to the second step 5. However, the movable tread board 52d
remains in the same plane as that of the tread board 5a of the second
convertible step 5 as illustrated in FIG. 2 because it is supported by the
forks 11 projecting from the second step 5.
When the convertible step unit 7 converted into the wheel chair carrying
configuration and carrying the wheel chair 70 thereon approaches the upper
horizontal exit section of the stairway or the upper landing floor 69, the
deceleration switch 66 is actuated by the actuator 8a of the actuator step
8 disposed in front of the first convertible step or the drop-down step 4.
Then, the deceleration switch 66 causes the control circuit (not shown) to
decrease the travel speed of the steps of the escalator apparatus and to
rotate the electric motor 39 of the upper guide rail unit 25a disposed on
the upper end portion 1a of the main frame 1 to drive the lead screw 38
through the shaft 39a, the sprocket wheel 40, the endless chain 42 and the
sprocket wheel 41. This rotation of the lead screw 38 causes the movable
guide rails 27 to shift from the wheel chair carrying mode of operation
(FIGS. 7 and 16) in which the movable ends of the movable guide rails 27
connected to the lead screw 38 are widely separated and substantially
parallel to the stationary guide rails 26 to the usual position for the
ordinary mode of operation (FIG. 16) in which they extend in the direction
of travel of the steps.
As the convertible steps 4, 5 and 6 are moved into this upper horizontal
area in which the upper guide rail unit 25a is disposed, each of the guide
rollers 43 and 44 of the drop-down step 4 is introduced between the
stationary guide rail 26 and the movable guide rail 27 of the respective
pair. The guide rollers 43 and 44 are guided or cammed by the skewed guide
rail unit 25a as they move along the guide rail unit 25a so that the
movable elements 45 and 46 with racks 45a and 46a are moved transversely
or widthwise with respect to the step 4 along the rails 47 and 48. This
widthwise sliding movement of the racked movable elements 45 and 46 causes
the rotation of the pinions 49a and 50a which are in engagement with the
racks 4e formed on the slidable holder rods 4b. The holder rods 4b are
then extended outwardly from the movable portion 56 and now can be
inserted into the locking holes 55a formed in the side main tread members
55 because the movable portion 56 and the main side members 55 are in
alignment.
As the convertible step 5 is moved into the upper horizontal area in which
the upper guide rail unit 25a is disposed, the guide rollers 43 and 44 of
the step 5 are introduced between the stationary guide rail 26 and the
movable guide rail 27. The guide rollers 43 and 44 are guided or cammed by
the skewed guide rail unit 25a as they move along the guide rail unit 25a
so that the movable elements 45 and 46 with racks 45a and 46a are moved
transversely or widthwise with respect to the step 5 along the rails 47
and 48. This widthwise sliding movement of the racked movable elements 45
and 46 causes the reverse rotation of the pinions 49a and 50a which are in
engagement with the racks 11a formed on the slidable forks 11. Therefore,
the forks 11 are pulled out as shown by arrows F in FIG. 7 from the fork
brackets 52a and 52b mounted to the movable tread board 52d of the next
convertible step 6. At this state, the movable tread board 52d on the
convertible step 6 is returned to its original position and supported by
the step main body 53, so that the forks 11 can smoothly be pulled out and
the movable tread portion 52d does not drop onto the main body 53.
With the convertible step unit 7 in this state, the wheel chair 70 can now
be moved from the tread board 5a of the convertible step 5 and the movable
tread board 52d of the convertible step 6 onto the upper landing board 69.
As the convertible step 6 is moved into the area in which the upper guide
rail unit 25a is disposed and the guide rollers 43 and 44 of the step 6
are guided or cammed by the skewed guide rail unit 25a as they move along
the guide rail unit 25a, the movable elements 45 and 46 with racks 45a and
46a are moved transversely or widthwise with respect to the step 6 along
the rails 47 and 48. This widthwise sliding movement of the racked movable
elements 45 and 46 causes the rotation of the pinions 49a and 50a which
are in engagement with the racks 12b on the wheel stoppers 12 to pull down
the wheel stoppers 12 to retract them within the tread surface 52d of the
step 6.
As the convertible step unit 7 leaves the horizontal section of the step
travel path in which the upper guide rail unit 25a is installed and moves
into the turn-around section of the stairway of the escalator, the
acceleration switch 67 of the unillustrated control circuit (not shown) is
actuated by the actuator 8a mounted on the step 8 in front of the first
convertible step 4 to increase the speed of the escalator to the ordinary
speed.
For a descending operation, the endless loop of the steps is driven in the
direction opposite to that described above in conjunction with the
ascending operation, and the deceleration switches 64 and 66 are to be
used as the acceleration switches and the acceleration switches 65 and 67
are to be used as the deceleration switches, and the switch actuator 8a
should be provided on the unillustrated step next to the third convertible
step 6. Also, the upper and the lower guide rail units 25a and 25b should
be shifted their positions so that the upper guide rail unit 25a drives
the respective movable elements 45 and 46 of the convertible steps 6, 5
and 4 to their activated wheel chair carrying positions in the named
order, and that the lower guide rail unit 25b drives the movable elements
45 and 46 of the convertible steps 6, 5 and 4 to their inactivated usual
positions.
When it is not necessary to activate the convertible step unit 7 to carry
the wheel chair, the guide rail units 25a and 25b should not be operated
so that all of the convertible steps 4, 5 and 6 may be used as ordinary
steps.
According to the above embodiment, even when the movable guide rails 27 of
the upper guide rail unit 25a is not shifted during the ascending
operation, the convertible steps 4, 5 and 6 can be converted from the
wheel chair carrying mode into the usual mode before they are driven under
the comb plate 72 of the upper landing floor 69 by the camming action of
the stationary guide rail 26 which is a passive mechanism requiring no
movement. Therefore, differing from the arrangement in which the
conversion of the steps from the wheel chair carrying mode to the ordinary
mode is achieved by an active mechanism such as an electrically driven
conversion mechanism, it is not possible that any convertible steps 4, 5
and 6 collides with the comb plate 72 of the upper landing board 69 before
they are converted from the wheel chair carrying configuration back to the
ordinary configuration. Thus, the damages to the convertible steps 4, 5
and 6 as well as the comb plate 72 of the escalator apparatus as
above-described can be prevented without the need for an additional
mechanism which may become complicated, making the escalator apparatus
safe, reliable and simple in structure.
Also, according to this embodiment, the upper and the lower guide rail
units 25a and 25b have fixed clearances W each defined at the stationary
ends of the guide rail units 25a and 25b secured to the main frame 1
between the stationary ends of the stationary guide rail 26 and the
movable guide rail 27. These clearances W through which the guide rollers
43 and 44 of the convertible steps 4, 5 and 6 are passed and guided are
provided at both the upper and the lower horizontal portions of the
stairway, so that the guide rollers 43 and 44 and therefore the movable
elements 45 and 46 are always maintained at the proper positions even
during the prolonged period of ordinary operation. Therefore, it is not
necessary to provide a mechanism for preventing the displacement of the
gears of the convertible steps. The position of the above clearances W is
not limited to that described in conjunction with the embodiment described
above and illustrated in the figures, but may be anywhere in the travel
path of the guide rollers 43 and 44.
When any abnormality happens, such as when the holder rods 4b are caught in
the receiving holes 55a and cannot be pulled out therefrom or when the
holder rods 4b cannot be inserted into the holes 55a, while the guide
rollers 43 and 44 of the respective convertible steps are being cammed by
the guide rails 29 during the conversion of the steps, the guide rollers
43 and 44 of the step that has not properly been converted cannot be moved
by the camming action of the guide rail unit 25a or 25b, resulting in a
great abnormal force exerting on the steps and/or guide rail units. This
force causes the compression springs 33 of the elastic support
arrangements for supporting the guide rail elements 29A to be compressed
to allow the guide rail elements 29A to become elastically displaced from
their home positions. This movement of the guide rail elements 29A is
detected by the detection switches 34 and the detection switches 34 causes
the control circuit (not shown) to stop the operation of the escalator
apparatus for repair. Alternatively, the escalator can be driven backwards
until the convertible step unit 7 disengages the guide rail unit 25a or
25b and restart the converting operation again by forwardly passing
through the guide rail unit 25a or 25b.
Accordingly, the proper completion of the convertible step converting
operation can be carried out without the need for stopping the escalator
apparatus and with the detection switches of a relatively simple
structure. According to the conventional arrangement disclosed in Japanese
Patent Publication No. 63-23113, the converting operation of the
convertible steps is carried out by stopping the convertible steps and the
conversion completeness is checked and confirmed in accordance with the
time needed for the operation and the completion signal through the use of
a relatively complicated detecting mechanism in which a detector is
mounted on each of three convertible steps and the movement amount is
calculated.
Since the guide rails 26 and 27 of the guide rail units 25a and 25b are
disposed generally within a horizontal plane, the space within the frame
truss in the depth direction can advantageously be more efficiently
utilized.
Also, since two guide rails of the guide rail units are arranged in
symmetry in the horizontal plane, the horizontal shakes of the escalator
steps when the guide rollers of the steps are being guided by the guide
rails of the guide rail unit can be greatly reduced as compared to the
case where a single guide rail is used to guide the guide rollers of the
steps. This is because a horizontal shaky movement of the step due to the
curved portion of either one of the guide rails can be suppressed by the
other of the guide rails. Therefore, the escalator steps can be driven
smoothly even through the area in which the conversion of the convertible
steps are achieved.
While the escalator apparatus of the above embodiment is arranged to
decelerate when the wheel chair is to be loaded onto and unloaded from the
escalator steps, the escalator apparatus of the present invention can also
be arranged to come to a halt during the loading and unloading of the
wheel chair. Also, the drop-down step 4 provided with the drop-down tread
board may be omitted when a sufficient space for carrying the wheel chair
can be obtained.
Further, each pair of the upper and the lower guide rail units may be
arranged to have two movable guide rails instead of one stationary guide
rail and one movable guide rail if it is desired.
Also, the escalator apparatus of the present invention may comprise an
intermediate guide rail disposed between the upper and the lower guide
rail units 25a and 25b for substantially continuously connecting them. The
intermediate guide rails are useful for preventing the guide rollers and
the movable elements from undesirably moving widthwise due to vibrations
or the like during the travelling of the steps. The intermediate guide
rails may be replaced with lock pins.
Further, the drive force transmitting mechanism, which is a rack-and-pinion
mechanisms in the above-described embodiment, may be replaced with a
mechanism including a chain and sprocket wheels. Also, the movable guide
rail units may include a movable portion which is rotatable or elevatable.
Furthermore, the present invention can be equally applicable to the
escalator apparatus having a convertible step unit of different structure
such as the unit that has different number of the convertible steps, the
convertible step including only one movable member and that has the
movable element of he different structure.
FIGS. 19 and 20 illustrate another embodiment of the escalator apparatus of
the present invention in which upper and the lower guide rail units 120
and 121 disposed in the upper and the lower horizontal sections of the
escalator main frame 1 for converting the convertible step unit 7 has a
structure different from that of the guide rail units 25a and 25b
described in conjunction with the previous embodiment.
Each of the guide rail units 120 and 121 comprises a pair of guide rails
122 and 123 of a substantially U-shaped cross section and disposed
generally in a horizontal plane such that the distance between the guide
rails 122 and 123 at one end is different from that at the other end. More
particularly, the guide rails 122 and 123 comprise narrow gauge sections
122a and 123a extending in parallel to the direction of movement of the
steps, wide gauge sections 122b and 123b parallel to the narrow gauge
sections 122a and 123a, and diagonal camming sections 122c and 123c
connected between the narrow and the wide gauge sections.
The guide rail units 120 and 121 also comprises an actuator mechanism 125
for selectively moving up and down the guide rails 122 and 123 according
to the mode of operation of the escalator apparatus. That is, the guide
rails 122 and 123 can be moved into an inactuated, lower normal position
in which the escalator steps including convertible steps 4, 5 and 6 are
not brought into engagement with the guide rail units 120 and 121 at their
guide rollers 43 and 44 and allowed to serve as ordinary escalator steps,
or the guide rails 122 and 123 can be moved into an actuated, elevated
position in which the guide rollers 43 and 44 of the convertible steps 4,
5 and 6 are guided or cammed by the guide rails 122 and 123 to drive the
respective movable parts of the convertible steps 4, 5 and 6. The actuator
mechanism 125 comprises a mounting plate 130 extending between the guide
rails 122 and 123 for supporting them, a rack rod 128 connected to the
mounting plate 130 and slidably supported by a bearing 29, a pinion 127
engaged with the rack rod 128 and an electric motor 126 for driving the
pinion 127.
As has been described, the escalator system of the present invention
comprises a main frame defining a circulating loop path therein, a
plurality of steps connected in an endless step loop disposed in the loop
path and a convertible step unit disposed in the step loop and having a
movable member. The convertible step unit defines at least one of the
steps with the movable member in an ordinary position in an ordinary
operating mode, and the step unit defining a convertible step having a
broad tread surface with the movable member displaced in a broad step
position in a convertible operating mode. A displacement mechanism having
one end engageable with the convertible step unit is disposed for
displacing the movable member of the convertible step unit between the
ordinary position and the broad step position by a drive force of the step
loop which is a drive force component in the direction of width of the
step. The other end of the displacement mechanism is engageable with a
guide rail only in the spacial operating mode for moving the displacement
mechanism in the step width direction by a camming action of the guide
rail.
The displacement mechanism may comprise a movable body having one end
engageable with the guide rail to be displaced in the width direction of
the step, and a drive force transmission mechanism, having one end
engageable with the movable body and the other end engageable with the
movable member of the convertible step unit, for being rotated by the
displacement of the movable body in the step width direction to cause the
displacement of the movable member.
In a preferred embodiment of the present invention, the convertible step
unit may comprise a first convertible step for defining the broad tread
surface with a first movable member displaced, a second convertible step
disposed adjacent to an upper level side of the first step for defining an
inclined tread surface with a second movable member displaced. The
convertible step unit may further comprise a third convertible step having
a main body and a tread board liftably mounted to the main body, a fourth
convertible step disposed adjacent to the upper side of the third
convertible step and causing a displacement of the movable member for
defining a flat broad tread surface together with the tread board of the
third convertible step.
The guide rail may be translatingly movable into and out of engagement with
the other end of the displacement mechanism in the broad tread operation
mode, or may be rotatably movable into and out of engagement with the
other end of the displacement mechanism in the broad tread operation mode.
Accordingly, the escalator system of the present invention has a higher
operating efficiency and has no need for stopping for automatic conversion
between two operational modes with a relatively simple and reliable
structure.
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